(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Calculate the following sum:

(click to expand)

3. The attempt at a solution

I tried something with Moivre formula and Newton binomial theorem but no result , should i continue with these or is there any simpler approach?

I just need some hints.

Thanks.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Sum of binomial coefficients and cos(kx)

**Physics Forums | Science Articles, Homework Help, Discussion**